Differential

Hello,
I have been trying to find out whether or not the Tesla Roadster has a differential on the rear axle. I have read in some places that it has a transaxle, whereas some say that the differential is incorporated into the borg warner gearbox. Can anyone definitively tell me which one of this is true?

The picture you have posted shows a motor attached to side of a gearbox. To my knowledge, this gearbox is the 31-01 Electric Drive Transmission supplied by Borg Warner. After reading more on the link you posted, the information I have gathered is that the axle goes at the bottom centre of the gearbox. In this picture, the reddish part at the bottom of the gearbox.
How is the axle a transaxle? Doesn't the Borg Warner gearbox included a differential??
Correct me if Im wrong,

I wonder if the "differential" shown earlier in this thread can have different ratio's. In autocross I'll never see 115 mph. Could a lower ratio quicken things up between 0-80?

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The torque "curve" (er., elbow) is really stilted towards low end, so having shorter gearing isn't going to help so much. Once you are up above 9K RPMs (80MPH) the torque and power are dropping off. Of all the things to ponder trying to improve on the Roadster, the 0-80 performance seems like one of the things that is already well optimized!

There are improvements that could be made that would benefit a short track with no long straights.

Remember the original two gears were for getting up to a top speed around 130. In first gear the car could get 0 to 60 in 3.9.

Then they dropped the second gear and fixed the gear ratio between one and two but tweaked and tweaked on the torque curves until they got it back to 3.9.

This improvement is with a less than ideal gear ratio for 0 to 60. If 60 or 80 was your max speed on a track there are surely gear and/or firmware changes that would eek out a few fractions of a second on times.

I wonder if the "differential" shown earlier in this thread can have different ratio's. In autocross I'll never see 115 mph. Could a lower ratio quicken things up between 0-80?

Click to expand...

How about just buying a smaller in diameter back tire/wheel combo for the track? Does the same thing. It will be much cheaper and you could use them whenever you want, then switch back for the daily driving.